Question 1 (1 point) Compare the ratio of the effusion rates of helium (MW = 4.0

Question

Question 1 (1 point)

Compare the ratio of the effusion rates of helium (MW = 4.003 g/mol) and methane CH4 (MW = 16.04 g/mol). The ratio of the effusion rates is (rateHe/rateCH4) is 2:1.

Question 1 options:

Question 2 (1 point)

According to the kinetic-molecular theory, the total kinetic energy of gas particles is constant (no energy loss through friction).

Question 2 options:

Question 3 (1 point)

What volume of O2 is needed to react completely with 20.9 L of H2 to give H2O if all gases are measured at 25.0oC and 1 atm?

The balanced chemical equation is: 2 H2 + O2 -> 2 H2O

The volume of O2 needed is

Question 3 options:

4.27 L

2.81 L

10.5 L

8.54 L

Question 4 (1 point)

The process of diffusion is the movement of one gas through another.

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Question 5 (1 point)

The process of diffusion is the movement of one gas through another.

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Question 6 (1 point)

The Van der Waals equation accounts for intermolecular attractions by adding a factor that increases the pressure.

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Question 7 (1 point)

At a given temperature and pressure, the gas with the lower molar mass effuses faster because the most probable speed of its molecules is higher, so more molecules can escape per unit time.

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Question 8 (1 point)

O2 molecules move more slowly than H2 molecules.

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Question 9 (1 point)

According to the kinetic-molecular theory, collisions of gas particles are non-elastic.

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Question 10 (1 point)

A molecule moving at a speed equal to the root-mean-square speed (rms speed) has the average kinetic energy.

Question 10 options:

Explanation / Answer

1) (rate of effusion )He / (rate of effusion ) CH4= [( Mol wt ) CH4/ ( Mol wt )He]1/2

(rate of effusion )He / (rate of effusion ) CH4 = 2:1

True

2) True ( at a particular temperature)

3) 2 H2 + O2 -> 2 H2O

2 volumes of hydrogen will react with 1 volume of oxygen

So with 20.9 volume of hydrogen 20.9 / 2 volumes of oxygen will react = 10.5 Volume

4) False : its movement of gas molecules from high concentration to low concentration

5)False : its movement of gas molecules from high concentration to low concentration

6) True: (P+an2/V2)(V?nb)=nRT .

7) True

8) True (due to high mol wt)

9) False ( they are elastic)

10) True

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